MCQOPTIONS
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MCQOPTIONS
This section includes 6 Mcqs, each offering curated multiple-choice questions to sharpen your Power Electronics Question and Answers Single-Phase HW AC-DC-1 knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A single-phase half-wave thyristor circuit with R load is triggered at an angle of = 0 . As such, the maximum value of the average output voltage would be given byConsider Vs = Vm sin t. |
| A. | Vm |
| B. | 2Vm/ |
| C. | Vm/ |
| D. | Vm/ |
| Answer» D. Vm/ | |
| 2. |
For a single phase thyristor circuit with R load & firing angle , the conduction angle can be given by |
| A. | + |
| B. | 2 + |
| C. | - |
| D. | |
| Answer» D. | |
| 3. |
In a single phase half-wave thyristor circuit with R load & Vs=Vm sin t, the maximum value of the load current can be given by |
| A. | 2Vm/R |
| B. | Vs/R |
| C. | Vm/2 |
| D. | Vs/2 |
| Answer» D. Vs/2 | |
| 4. |
In the method of phase control, the phase relationship between ___ & ___ is controlled by varying the firing angle |
| A. | supply current, supply voltage |
| B. | end of the load current, end of the load voltage |
| C. | start of the load current, start of the load voltage |
| D. | load current, load voltage |
| Answer» D. load current, load voltage | |
| 5. |
The average output voltage is maximum when SCR is triggered at t = |
| A. | |
| B. | 0 |
| C. | /2 |
| D. | /4 |
| Answer» C. /2 | |
| 6. |
A voltage source Vs = Vm sin t is connected in series with a resistance R and an SCR. At some firing angle delay of a positive gate pulse is applied to the SCR which turns on the SCR. Considering ideal conditions, at the instant the voltage at the resistor terminals Vo |
| A. | falls to zero |
| B. | falls to Vm sin |
| C. | rises to Vm sin |
| D. | rises to Vm sin t |
| Answer» D. rises to Vm sin t | |